Test ahash

Author: Zoxc

src/librustc_data_structures/Cargo.toml

@@ -21,7 +21,7 @@ cfg-if = "0.1.2"
 stable_deref_trait = "1.0.0"
 rayon = { version = "0.1.2", package = "rustc-rayon" }
 rayon-core = { version = "0.1.2", package = "rustc-rayon-core" }
-rustc-hash = "1.0.1"
+ahash = { git = "https://github.com/tkaitchuck/aHash.git" }
 smallvec = { version = "0.6.7", features = ["union", "may_dangle"] }
 
 [dependencies.parking_lot]

src/librustc_data_structures/fx.rs

@@ -1 +1,10 @@
-pub use rustc_hash::{FxHasher, FxHashMap, FxHashSet};
+use std::hash::BuildHasherDefault;
+use std::collections::hash_map::HashMap;
+use std::collections::hash_set::HashSet;
+pub use ahash::AHasher as FxHasher;
+
+/// Type alias for a hashmap using the `fx` hash algorithm.
+pub type FxHashMap<K, V> = HashMap<K, V, BuildHasherDefault<FxHasher>>;
+
+/// Type alias for a hashmap using the `fx` hash algorithm.
+pub type FxHashSet<V> = HashSet<V, BuildHasherDefault<FxHasher>>;